[PATCH] D82701: [clangd][Hover] Dont crash on null types

[Kadir Cetinkaya via Phabricator via cfe-commits]

kadircet created this revision.
kadircet added reviewers: hokein, sammccall.
Herald added subscribers: cfe-commits, usaxena95, arphaman, jkorous, MaskRay, ilya-biryukov.
Herald added a project: clang.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D82701

Files:
  clang-tools-extra/clangd/Hover.cpp
  clang-tools-extra/clangd/unittests/HoverTests.cpp


Index: clang-tools-extra/clangd/unittests/HoverTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/HoverTests.cpp
+++ clang-tools-extra/clangd/unittests/HoverTests.cpp
@@ -708,6 +708,24 @@
          HI.Definition = "X x";
          HI.Type = "struct X";
        }},
+      {// Don't crash on null types.
+       R"cpp(
+          #define M(l, r) l = r
+          int bar();
+          void foo() {
+            M(auto [^[[x]]], bar()); /*error-ok*/
+          }
+          )cpp",
+       [](HoverInfo &HI) {
+         HI.Name = "x";
+         HI.Kind = index::SymbolKind::Variable;
+         HI.NamespaceScope = "";
+         HI.LocalScope = "foo::";
+         HI.Definition = "";
+         HI.Type = "NULL TYPE";
+         // Bindings are in theory public members of an anonymous struct.
+         HI.AccessSpecifier = "public";
+       }},
   };
   for (const auto &Case : Cases) {
     SCOPED_TRACE(Case.Code);
Index: clang-tools-extra/clangd/Hover.cpp
===================================================================
--- clang-tools-extra/clangd/Hover.cpp
+++ clang-tools-extra/clangd/Hover.cpp
@@ -124,8 +124,8 @@
   // TypePrinter doesn't resolve decltypes, so resolve them here.
   // FIXME: This doesn't handle composite types that contain a decltype in them.
   // We should rather have a printing policy for that.
-  while (const auto *DT = QT->getAs<DecltypeType>())
-    QT = DT->getUnderlyingType();
+  while (!QT.isNull() && QT->isDecltypeType())
+    QT = QT->getAs<DecltypeType>()->getUnderlyingType();
   return QT.getAsString(Policy);
 }
 


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